Permits in Smith County are primarily handled by individual incorporated cities for projects within their respective jurisdictions. The Smith County Development Services department oversees development and permitting only for unincorporated areas of the county. Floodplain development permits are required for all construction within designated flood hazard areas regardless of jurisdiction.
How this fits with the state
The state authority here is Texas Department of Licensing and Regulation; Texas State Board of Plumbing Examiners. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.